Hi! I’m new here. Have been reading posts for a while, but now I need some recommendations. A few months ago we dragged a ‘93 that had been wrecked then sitting in my dad’s barn for 18 years. We have almost completely rebuilt it. Lots of new parts, but also still lots of cleaned up original parts. We finally got it finished up yesterday. First trip out, it ran great, but bogged down taking off once after a few miles. Second run, bogged down at one take-off again, but otherwise ran great. Longer trip today, after about 20 miles, it decided not to run anymore. It will start and idle fine. It will also rev up high just sitting. When in gear and attempt to move, it will just bog down and die. We haven’t really checked anything yet, I’m just frustrated.

Luckily we have a cool tow vehicle.

 

Welcome to the forum JVC

You have done a great job with the resto on the F2 it looks great.
I also have to agree that the tow car and its garage pall are mighty fine indeed

You issues seem related to fuel starvation so could be carb or fuel pump related. Did you get the carbs properly clean?

Cheers
Al

 

Hi and welcome! That's nice looking bike!

Your issue is clogged dirty carbs. Needs complete refurb with disassembly down to every last nut, bolt and individual part. Everything scrubbed with brushes and PEA-based fuel-system cleaner (including hidden secret passages in carb-body). Spray carb-cleaners no longer work due to removal of chlorinated compounds.

Then ultrasonic soak everything. Micro soda-blast at very end to clean up. Adjust float levels with final wet-test. Replace all rubbers: fuel-rail O-rings, pilot screw O-rings, float-valves, float-bowl seals, and slide diaphragms if needed. Sync carbs and adjust idle.

Bike ran perfectly fine when leaving showroom floor. It will again when carbs are restored to factory-fresh clean condition.













That's a lot of work and requires lots of experience and equipment. I just send my carbs to this outfit for refurb every winter when I'm overhauling my race bike. Since I run in stock class, restoring carbs to factory-fresh condition is one of "mods" that make HUGE difference compared to others running with clogged carbs causing stumbling and revving laziness.

https://customcarbservices.com

 

Since it ran great at first, I'm guessing you have junk somewhere in the fuel line, petcock or gas tank.
Some of that came loose and went into the carbs.

So you'll have to clean the carbs again. Also clean the inside of the petcock and make sure the inside of the tank is clean.
Some of the passages inside the carbs are Y-shaped. Make sure to clean all 3 passages, inside the float bowl, inside the venturis, and on top of the carbs.
I often strip a bit of lamp electrical cord, then split out a strand of the fine wire and run it in and out of the passages.
Spray with carb cleaner and BLOW dry with compressed air. if you just let them dry, the small ones can clog again.

 

Thanks! We like our fast cars and bikes. Love spending the time with my dad working and playing on them, too.

We did clean the carbs thoroughly the first time through. But, we took them off and opened them back up. Checked a couple things, but didn't really see anything concerning. Put it all back together and kept looking. It sounded just a little rough, so I checked the exhaust pipe temps and the center 2 weren't getting hot. Poked around a little more, and found the culprit. One of the coil connector wires had apparently gotten into the fan and was pretty much severed. Not sure how that happened, but repaired it, ziptied it safely away from the fan, and off she went! Runs like a champ! Hard to believe it was even running and didn't really sound bad! So glad it was something easy!

Thank you all for your help! The detailed pictures of the carbs are great!

 

Glad you got it sorted out. So what's the next project in the que?

 

There are always projects waiting, aren't there?!
No more motorcycle projects right now. After my daughter's wedding next month, there's a Buick with a blown head gasket (my son also likes to drive fast and aggressively), and a Grand Prix GTP that has been sitting for too long and needs a LOT of TLC. Hopefully the critters haven't chewed the wiring. We also need to put a T56 in the Chevelle.